package com.xique.common.core.utils.sign;

import javax.crypto.Cipher;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * @author shd
 * @create 2021/11/15 11:41
 */
public class RsaUtils {
    // Rsa 私钥
    public static String privateKey = "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";

    public static String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCWe4+4XLmD+qttScbk5nAJB80h96Bbe8gIvj7O8exj4RqxK3zXE4XIJgMW9z6M+QuExSbdU78oaKq3emziffLvlJnsXrox6K7LLgZBDots7CiWo0Rq4OnOigZSgXhHGw8BFG04c/rZdlj77lACZNhdx0THKbo25cUHBqFfQMa1lwIDAQAB";

    /**
     * 私钥解密
     *
//     * @param privateKeyString 私钥
     * @param text 待解密的文本
     * @return 解密后的文本
     */
    public static String decryptByPrivateKey(String text) throws Exception
    {
        return decryptByPrivateKey(privateKey, text);
    }

    /**
     * 公钥解密
     *
     * @param publicKeyString 公钥
     * @param text 待解密的信息
     * @return 解密后的文本
     */
    public static String decryptByPublicKey(String publicKeyString, String text) throws Exception
    {
        X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(Base64.decode(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(Base64.decode(text));
        return new String(result);
    }

    /**
     * 私钥加密
     *
     * @param privateKeyString 私钥
     * @param text 待加密的信息
     * @return 加密后的文本
     */
    public static String encryptByPrivateKey(String privateKeyString, String text) throws Exception
    {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decode(privateKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encode(result);
    }

    /**
     * 私钥解密
     *
     * @param privateKeyString 私钥
     * @param text 待解密的文本
     * @return 解密后的文本
     */
    public static String decryptByPrivateKey(String privateKeyString, String text) throws Exception
    {
        PKCS8EncodedKeySpec pkcs8EncodedKeySpec5 = new PKCS8EncodedKeySpec(Base64.decode(privateKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec5);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.DECRYPT_MODE, privateKey);
        byte[] result = cipher.doFinal(Base64.decode(text));
        return new String(result);
    }

    /**
     * 公钥加密
     *
     * @param publicKeyString 公钥
     * @param text 待加密的文本
     * @return 加密后的文本
     */
    public static String encryptByPublicKey(String publicKeyString, String text) throws Exception
    {
        X509EncodedKeySpec x509EncodedKeySpec2 = new X509EncodedKeySpec(Base64.decode(publicKeyString));
        KeyFactory keyFactory = KeyFactory.getInstance("RSA");
        PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec2);
        Cipher cipher = Cipher.getInstance("RSA");
        cipher.init(Cipher.ENCRYPT_MODE, publicKey);
        byte[] result = cipher.doFinal(text.getBytes());
        return Base64.encode(result);
    }

    /**
     * 构建RSA密钥对
     *
     * @return 生成后的公私钥信息
     */
    public static RsaKeyPair generateKeyPair() throws NoSuchAlgorithmException
    {
        KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
        keyPairGenerator.initialize(1024);
        KeyPair keyPair = keyPairGenerator.generateKeyPair();
        RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();
        RSAPrivateKey rsaPrivateKey = (RSAPrivateKey) keyPair.getPrivate();
        String publicKeyString = Base64.encode(rsaPublicKey.getEncoded());
        String privateKeyString = Base64.encode(rsaPrivateKey.getEncoded());
        return new RsaKeyPair(publicKeyString, privateKeyString);
    }

    /**
     * RSA密钥对对象
     */
    public static class RsaKeyPair
    {
        private final String publicKey;
        private final String privateKey;

        public RsaKeyPair(String publicKey, String privateKey)
        {
            this.publicKey = publicKey;
            this.privateKey = privateKey;
        }

        public String getPublicKey()
        {
            return publicKey;
        }

        public String getPrivateKey()
        {
            return privateKey;
        }
    }
}
